JavaScript教程之实现上下文字滚动特效

 JavaScript教程之实现上下文字滚动特效　　具体实现方法如下：<script language=JavaScript><p>var messages=new Array()</p><p>messages[0]="<font color=#8000FF>欢迎光临赛迪网电脑应用频道！</font></a>"</p><p>messages[1]="<font color=#FB2500>这里有织网梦工厂</font></a>"</p><p>messages[2]="<font color=#FF0066F>是网页初学者的学习园地</font></a>"</p><p>messages[3]="<font color=#FF9900>这里冲浪指南针</font></a>"</p><p>messages[4]="<font color=#00CC33>是网络爱好者天天必来充电的地方</font></a>"</p><p>messages[5]="<font color=#000000>这里有…………有精彩的内容等着你</font></a>"</p><p>var scrollerwidth=320</p><p>var scrollerheight=100</p><p>var scrollerbgcolor=´#FFFFFF´</p><p>//下面的代码不要改动</p><p>if (messages.length>1)</p><p>i=2</p><p>else</p><p>i=0</p><p>function move1(whichlayer){</p><p>tlayer=eval(whichlayer)</p><p>if (tlayer.top>0&&tlayer.top<=5){</p><p>tlayer.top=0</p><p>setTimeout("move1(tlayer)",3000)</p><p>setTimeout("move2(document.main.document.second)",3000)</p><p>return}</p><p>if (tlayer.top>=tlayer.document.height*-1){</p><p>tlayer.top-=5</p><p>setTimeout("move1(tlayer)",100)}</p><p>else{</p><p>tlayer.top=scrollerheight</p><p>tlayer.document.write(messages[i])</p><p>tlayer.document.close()</p><p>if (i==messages.length-1)</p><p>i=0</p><p>else</p><p>i++}}</p><p>function move2(whichlayer){</p><p>tlayer2=eval(whichlayer)</p><p>if (tlayer2.top>0&&tlayer2.top<=5){</p><p>tlayer2.top=0</p><p>setTimeout("move2(tlayer2)",3000)</p><p>setTimeout("move1(document.main.document.first)",3000)</p><p>return}</p><p>if (tlayer2.top>=tlayer2.document.height*-1){</p><p>tlayer2.top-=5</p><p>setTimeout("move2(tlayer2)",100)}</p><p>else{</p><p>tlayer2.top=scrollerheight</p><p>tlayer2.document.write(messages[i])</p><p>tlayer2.document.close()</p><p>if (i==messages.length-1)</p><p>i=0</p><p>else</p><p>i++}}</p><p>function move3(whichdiv){</p><p>tdiv=eval(whichdiv)</p><p>if (tdiv.style.pixelTop>0&&tdiv.style.pixelTop<=5){</p><p>tdiv.style.pixelTop=0</p><p>setTimeout("move3(tdiv)",3000)</p><p>setTimeout("move4(second2)",3000)</p><p>return}</p><p>if (tdiv.style.pixelTop>=tdiv.offsetHeight*-1){</p><p>tdiv.style.pixelTop-=5</p><p>setTimeout("move3(tdiv)",100)}</p><p>else{</p><p>tdiv.style.pixelTop=scrollerheight</p><p>tdiv.innerHTML=messages[i]</p><p>if (i==messages.length-1)</p><p>i=0</p><p>else</p><p>i++}}</p><p>function move4(whichdiv){</p><p>tdiv2=eval(whichdiv)</p><p>if (tdiv2.style.pixelTop>0&&tdiv2.style.pixelTop<=5){</p><p>tdiv2.style.pixelTop=0</p><p>setTimeout("move4(tdiv2)",3000)</p><p>setTimeout("move3(first2)",3000)</p><p>return}</p><p>if (tdiv2.style.pixelTop>=tdiv2.offsetHeight*-1){</p><p>tdiv2.style.pixelTop-=5</p><p>setTimeout("move4(second2)",100)}</p><p>else{</p><p>tdiv2.style.pixelTop=scrollerheight</p><p>tdiv2.innerHTML=messages[i]</p><p>if (i==messages.length-1)</p><p>i=0</p><p>else</p><p>i++}}</p><p>function startscroll(){</p><p>if (document.all){</p><p>move3(first2)</p><p>second2.style.top=scrollerheight}</p><p>else if (document.layers){</p><p>move1(document.main.document.first)</p><p>document.main.document.second.top=scrollerheight+5</p><p>document.main.document.second.visibility=´show´}}</p><p>window.onload=startscroll</p><p></script></p><p><ilayer id="main" width=&{scrollerwidth}; height=&{scrollerheight};</p><p>bgcolor=&{scrollerbgcolor};></p><p><layer id="first" left=0 top=1 width=&{scrollerwidth};></p><p><script language="JavaScript1.2"></p><p>if (document.layers)</p><p>document.write(messages[0])</p><p></script></p><p></layer></p><p><layer id="second" left=0 top=0 width=&{scrollerwidth}; visibility=hide></p><p><script language="JavaScript1.2"></p><p>if (document.layers)</p><p>document.write(messages[1])</p><p></script></p><p></layer></p><p></ilayer></p><p><script language="JavaScript1.2"></p><p>if (document.all){</p><p>document.writeln(´<span id="main2" style="position:relative;width:´+scrollerwidth+´;height:´</p><p>+scrollerheight+´;overflow:hiden;background-color:´+scrollerbgcolor+´">´)</p><p>document.writeln(´<div style="position:absolute;width:´+scrollerwidth+´;height:´</p><p>+scrollerheight+´;clip:rect(0 ´+scrollerwidth+´ ´</p><p>+scrollerheight+´ 0);left:0;top:0">´)</p><p>document.writeln(´<div id="first2" style="position:absolute;width:´+scrollerwidth+´;left:0;top:1;">´)</p><p>document.write(messages[0])</p><p>document.writeln(´</div>´)</p><p>document.writeln(´<div id="second2" style="position:absolute;width:´+scrollerwidth+´;left:0;top:0">´)</p><p>document.write(messages[1])</p><p>document.writeln(´</div>´)</p><p>document.writeln(´</div>´)</p><p>document.writeln(´</span>´)</p><p>}</p><p></script></p>　　（在需要添加该特效的网页具体位置中粘贴如下代码即可）　　注意：代码中的“var scrollerwidth=320”表示循环框宽度，“var scrollerheigh=100”表示循环框高度，“font color=# ”代表文字颜色，可以根据需要进行修改。